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<div class="textblock"><code>#include &quot;<a class="el" href="helpers_8h_source.xhtml">helpers.h</a>&quot;</code><br/>
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<p><a href="canny_8cl_source.xhtml">Go to the source code of this file.</a></p>
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Macros</h2></td></tr>
<tr class="memitem:ac243bfa96aa2c28014159ff098bd2324"><td class="memItemLeft" align="right" valign="top">#define&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="canny_8cl.xhtml#ac243bfa96aa2c28014159ff098bd2324">EDGE</a>&#160;&#160;&#160;255</td></tr>
<tr class="separator:ac243bfa96aa2c28014159ff098bd2324"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:a242e5ec23ae26cd2dfa5eab5ae68a0f1"><td class="memItemLeft" align="right" valign="top">#define&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="canny_8cl.xhtml#a242e5ec23ae26cd2dfa5eab5ae68a0f1">hysteresis_local_stack_L1</a>&#160;&#160;&#160;8</td></tr>
<tr class="separator:a242e5ec23ae26cd2dfa5eab5ae68a0f1"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:aa55093fb165fb76898efb3ba80f62bae"><td class="memItemLeft" align="right" valign="top">#define&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="canny_8cl.xhtml#aa55093fb165fb76898efb3ba80f62bae">hysteresis_local_stack_L2</a>&#160;&#160;&#160;16</td></tr>
<tr class="separator:aa55093fb165fb76898efb3ba80f62bae"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:a64ee229d1bcee88c8017356d5d485650"><td class="memItemLeft" align="right" valign="top">#define&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="canny_8cl.xhtml#a64ee229d1bcee88c8017356d5d485650">check_pixel</a>(early_test, x_pos, y_pos, x_cur, y_cur)</td></tr>
<tr class="memdesc:a64ee229d1bcee88c8017356d5d485650"><td class="mdescLeft">&#160;</td><td class="mdescRight">Check whether pixel is valid.  <a href="#a64ee229d1bcee88c8017356d5d485650">More...</a><br/></td></tr>
<tr class="separator:a64ee229d1bcee88c8017356d5d485650"><td class="memSeparator" colspan="2">&#160;</td></tr>
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Functions</h2></td></tr>
<tr class="memitem:a92f95668118a1bc6ef0eed965dfd570f"><td class="memItemLeft" align="right" valign="top">__kernel void&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="canny_8cl.xhtml#a92f95668118a1bc6ef0eed965dfd570f">combine_gradients_L1</a> (__global uchar *src1_ptr, uint src1_stride_x, uint src1_step_x, uint src1_stride_y, uint src1_step_y, uint src1_offset_first_element_in_bytes, __global uchar *src2_ptr, uint src2_stride_x, uint src2_step_x, uint src2_stride_y, uint src2_step_y, uint src2_offset_first_element_in_bytes, __global uchar *grad_ptr, uint grad_stride_x, uint grad_step_x, uint grad_stride_y, uint grad_step_y, uint grad_offset_first_element_in_bytes, __global uchar *angle_ptr, uint angle_stride_x, uint angle_step_x, uint angle_stride_y, uint angle_step_y, uint angle_offset_first_element_in_bytes)</td></tr>
<tr class="memdesc:a92f95668118a1bc6ef0eed965dfd570f"><td class="mdescLeft">&#160;</td><td class="mdescRight">Calculate the magnitude and phase from horizontal and vertical result of sobel result.  <a href="#a92f95668118a1bc6ef0eed965dfd570f">More...</a><br/></td></tr>
<tr class="separator:a92f95668118a1bc6ef0eed965dfd570f"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:a7046357526e2f95a34e3ffa217752d9f"><td class="memItemLeft" align="right" valign="top">__kernel void&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="canny_8cl.xhtml#a7046357526e2f95a34e3ffa217752d9f">combine_gradients_L2</a> (__global uchar *src1_ptr, uint src1_stride_x, uint src1_step_x, uint src1_stride_y, uint src1_step_y, uint src1_offset_first_element_in_bytes, __global uchar *src2_ptr, uint src2_stride_x, uint src2_step_x, uint src2_stride_y, uint src2_step_y, uint src2_offset_first_element_in_bytes, __global uchar *grad_ptr, uint grad_stride_x, uint grad_step_x, uint grad_stride_y, uint grad_step_y, uint grad_offset_first_element_in_bytes, __global uchar *angle_ptr, uint angle_stride_x, uint angle_step_x, uint angle_stride_y, uint angle_step_y, uint angle_offset_first_element_in_bytes)</td></tr>
<tr class="memdesc:a7046357526e2f95a34e3ffa217752d9f"><td class="mdescLeft">&#160;</td><td class="mdescRight">Calculate the gradient and angle from horizontal and vertical result of sobel result.  <a href="#a7046357526e2f95a34e3ffa217752d9f">More...</a><br/></td></tr>
<tr class="separator:a7046357526e2f95a34e3ffa217752d9f"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:a8c233c75ee1010bcec8601d559f4be68"><td class="memItemLeft" align="right" valign="top">__kernel void&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="canny_8cl.xhtml#a8c233c75ee1010bcec8601d559f4be68">suppress_non_maximum</a> (__global uchar *grad_ptr, uint grad_stride_x, uint grad_step_x, uint grad_stride_y, uint grad_step_y, uint grad_offset_first_element_in_bytes, __global uchar *angle_ptr, uint angle_stride_x, uint angle_step_x, uint angle_stride_y, uint angle_step_y, uint angle_offset_first_element_in_bytes, __global uchar *non_max_ptr, uint non_max_stride_x, uint non_max_step_x, uint non_max_stride_y, uint non_max_step_y, uint non_max_offset_first_element_in_bytes, uint lower_thr)</td></tr>
<tr class="memdesc:a8c233c75ee1010bcec8601d559f4be68"><td class="mdescLeft">&#160;</td><td class="mdescRight">Perform non maximum suppression.  <a href="#a8c233c75ee1010bcec8601d559f4be68">More...</a><br/></td></tr>
<tr class="separator:a8c233c75ee1010bcec8601d559f4be68"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:acd62ae1c9f3d7a1c7e49499d308d1904"><td class="memItemLeft" align="right" valign="top">kernel void&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="canny_8cl.xhtml#acd62ae1c9f3d7a1c7e49499d308d1904">hysteresis</a> (__global uchar *src_ptr, uint src_stride_x, uint src_step_x, uint src_stride_y, uint src_step_y, uint src_offset_first_element_in_bytes, __global uchar *out_ptr, uint out_stride_x, uint out_step_x, uint out_stride_y, uint out_step_y, uint out_offset_first_element_in_bytes, __global uchar *visited_ptr, uint visited_stride_x, uint visited_step_x, uint visited_stride_y, uint visited_step_y, uint visited_offset_first_element_in_bytes, __global uchar *recorded_ptr, uint recorded_stride_x, uint recorded_step_x, uint recorded_stride_y, uint recorded_step_y, uint recorded_offset_first_element_in_bytes, __global uchar *l1_stack_ptr, uint l1_stack_stride_x, uint l1_stack_step_x, uint l1_stack_stride_y, uint l1_stack_step_y, uint l1_stack_offset_first_element_in_bytes, __global uchar *l1_stack_counter_ptr, uint l1_stack_counter_stride_x, uint l1_stack_counter_step_x, uint l1_stack_counter_stride_y, uint l1_stack_counter_step_y, uint l1_stack_counter_offset_first_element_in_bytes, uint low_thr, uint up_thr, int width, int height)</td></tr>
<tr class="memdesc:acd62ae1c9f3d7a1c7e49499d308d1904"><td class="mdescLeft">&#160;</td><td class="mdescRight">Perform hysteresis.  <a href="#acd62ae1c9f3d7a1c7e49499d308d1904">More...</a><br/></td></tr>
<tr class="separator:acd62ae1c9f3d7a1c7e49499d308d1904"><td class="memSeparator" colspan="2">&#160;</td></tr>
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Variables</h2></td></tr>
<tr class="memitem:a65e45b2f8637f10dd14a427f37c2cd4c"><td class="memItemLeft" align="right" valign="top">__constant short4&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="canny_8cl.xhtml#a65e45b2f8637f10dd14a427f37c2cd4c">neighbours_coords</a> []</td></tr>
<tr class="memdesc:a65e45b2f8637f10dd14a427f37c2cd4c"><td class="mdescLeft">&#160;</td><td class="mdescRight">Array that holds the relative coordinates offset for the neighbouring pixels.  <a href="#a65e45b2f8637f10dd14a427f37c2cd4c">More...</a><br/></td></tr>
<tr class="separator:a65e45b2f8637f10dd14a427f37c2cd4c"><td class="memSeparator" colspan="2">&#160;</td></tr>
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<h2 class="groupheader">Macro Definition Documentation</h2>
<a class="anchor" id="a64ee229d1bcee88c8017356d5d485650"></a>
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          <td class="memname">#define check_pixel</td>
          <td>(</td>
          <td class="paramtype">&#160;</td>
          <td class="paramname">early_test, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">&#160;</td>
          <td class="paramname">x_pos, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">&#160;</td>
          <td class="paramname">y_pos, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">&#160;</td>
          <td class="paramname">x_cur, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">&#160;</td>
          <td class="paramname">y_cur&#160;</td>
        </tr>
        <tr>
          <td></td>
          <td>)</td>
          <td></td><td></td>
        </tr>
      </table>
</div><div class="memdoc">
<b>Value:</b><div class="fragment"><div class="line">{                                                                                     \</div>
<div class="line">        if(!early_test)                                                                   \</div>
<div class="line">        {                                                                                 \</div>
<div class="line">            <span class="comment">/* Number of elements in the local stack 1, points to next available entry */</span> \</div>
<div class="line">            c = *((__global <span class="keywordtype">char</span> *)<a class="code" href="helpers_8h.xhtml#a009469e4d9b8fce3b6d5e97d2077827d">offset</a>(&amp;l1_stack_counter, x_cur, y_cur));              \</div>
<div class="line">            \</div>
<div class="line">            if(c &gt; (<a class="code" href="canny_8cl.xhtml#a242e5ec23ae26cd2dfa5eab5ae68a0f1">hysteresis_local_stack_L1</a> - 1)) <span class="comment">/* Stack level 1 is full */</span>           \</div>
<div class="line">                goto pop_stack;                                                           \</div>
<div class="line">            \</div>
<div class="line">            <span class="comment">/* The pixel that has already been recorded is ignored */</span>                     \</div>
<div class="line">            if(!atomic_or((__global uint *)<a class="code" href="helpers_8h.xhtml#a009469e4d9b8fce3b6d5e97d2077827d">offset</a>(&amp;recorded, x_pos, y_pos), 1))           \</div>
<div class="line">            {                                                                             \</div>
<div class="line">                l1_ptr[c] = (short2)(x_pos, y_pos);                                       \</div>
<div class="line">                *((__global <span class="keywordtype">char</span> *)<a class="code" href="helpers_8h.xhtml#a009469e4d9b8fce3b6d5e97d2077827d">offset</a>(&amp;l1_stack_counter, x_cur, y_cur)) += 1;         \</div>
<div class="line">            }                                                                             \</div>
<div class="line">        }                                                                                 \</div>
<div class="line">    }</div>
<div class="ttc" id="canny_8cl_xhtml_a242e5ec23ae26cd2dfa5eab5ae68a0f1"><div class="ttname"><a href="canny_8cl.xhtml#a242e5ec23ae26cd2dfa5eab5ae68a0f1">hysteresis_local_stack_L1</a></div><div class="ttdeci">#define hysteresis_local_stack_L1</div><div class="ttdef"><b>Definition:</b> <a href="canny_8cl_source.xhtml#l00228">canny.cl:228</a></div></div>
<div class="ttc" id="helpers_8h_xhtml_a009469e4d9b8fce3b6d5e97d2077827d"><div class="ttname"><a href="helpers_8h.xhtml#a009469e4d9b8fce3b6d5e97d2077827d">offset</a></div><div class="ttdeci">__global uchar * offset(const Image *img, int x, int y)</div><div class="ttdoc">Get the pointer position of a Image. </div><div class="ttdef"><b>Definition:</b> <a href="helpers_8h_source.xhtml#l00295">helpers.h:295</a></div></div>
</div><!-- fragment -->
<p>Check whether pixel is valid. </p>
<p>Skip the pixel if the early_test fails. Otherwise, it tries to add the pixel coordinate to the stack, and proceed to popping the stack instead if the stack is full</p>
<dl class="params"><dt>Parameters</dt><dd>
  <table class="params">
    <tr><td class="paramdir">[in]</td><td class="paramname">early_test</td><td>Boolean condition based on the minv check and visited buffer check </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">x_pos</td><td>X-coordinate of pixel that is going to be recorded, has to be within the boundary </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">y_pos</td><td>Y-coordinate of pixel that is going to be recorded, has to be within the boundary </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">x_cur</td><td>X-coordinate of current central pixel </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">y_cur</td><td>Y-coordinate of current central pixel </td></tr>
  </table>
  </dd>
</dl>

<p>Definition at line <a class="el" href="canny_8cl_source.xhtml#l00242">242</a> of file <a class="el" href="canny_8cl_source.xhtml">canny.cl</a>.</p>

<p>Referenced by <a class="el" href="canny_8cl_source.xhtml#l00306">hysteresis()</a>.</p>

</div>
</div>
<a class="anchor" id="ac243bfa96aa2c28014159ff098bd2324"></a>
<div class="memitem">
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          <td class="memname">#define EDGE&#160;&#160;&#160;255</td>
        </tr>
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</div><div class="memdoc">

<p>Definition at line <a class="el" href="canny_8cl_source.xhtml#l00227">227</a> of file <a class="el" href="canny_8cl_source.xhtml">canny.cl</a>.</p>

<p>Referenced by <a class="el" href="canny_8cl_source.xhtml#l00306">hysteresis()</a>.</p>

</div>
</div>
<a class="anchor" id="a242e5ec23ae26cd2dfa5eab5ae68a0f1"></a>
<div class="memitem">
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          <td class="memname">#define hysteresis_local_stack_L1&#160;&#160;&#160;8</td>
        </tr>
      </table>
</div><div class="memdoc">

<p>Definition at line <a class="el" href="canny_8cl_source.xhtml#l00228">228</a> of file <a class="el" href="canny_8cl_source.xhtml">canny.cl</a>.</p>

<p>Referenced by <a class="el" href="canny_8cl_source.xhtml#l00306">hysteresis()</a>.</p>

</div>
</div>
<a class="anchor" id="aa55093fb165fb76898efb3ba80f62bae"></a>
<div class="memitem">
<div class="memproto">
      <table class="memname">
        <tr>
          <td class="memname">#define hysteresis_local_stack_L2&#160;&#160;&#160;16</td>
        </tr>
      </table>
</div><div class="memdoc">

<p>Definition at line <a class="el" href="canny_8cl_source.xhtml#l00229">229</a> of file <a class="el" href="canny_8cl_source.xhtml">canny.cl</a>.</p>

<p>Referenced by <a class="el" href="canny_8cl_source.xhtml#l00306">hysteresis()</a>.</p>

</div>
</div>
<h2 class="groupheader">Function Documentation</h2>
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      <table class="memname">
        <tr>
          <td class="memname">__kernel void combine_gradients_L1 </td>
          <td>(</td>
          <td class="paramtype">__global uchar *&#160;</td>
          <td class="paramname"><em>src1_ptr</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">uint&#160;</td>
          <td class="paramname"><em>src1_stride_x</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">uint&#160;</td>
          <td class="paramname"><em>src1_step_x</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">uint&#160;</td>
          <td class="paramname"><em>src1_stride_y</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">uint&#160;</td>
          <td class="paramname"><em>src1_step_y</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">uint&#160;</td>
          <td class="paramname"><em>src1_offset_first_element_in_bytes</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">__global uchar *&#160;</td>
          <td class="paramname"><em>src2_ptr</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">uint&#160;</td>
          <td class="paramname"><em>src2_stride_x</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">uint&#160;</td>
          <td class="paramname"><em>src2_step_x</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">uint&#160;</td>
          <td class="paramname"><em>src2_stride_y</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">uint&#160;</td>
          <td class="paramname"><em>src2_step_y</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">uint&#160;</td>
          <td class="paramname"><em>src2_offset_first_element_in_bytes</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">__global uchar *&#160;</td>
          <td class="paramname"><em>grad_ptr</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">uint&#160;</td>
          <td class="paramname"><em>grad_stride_x</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">uint&#160;</td>
          <td class="paramname"><em>grad_step_x</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">uint&#160;</td>
          <td class="paramname"><em>grad_stride_y</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">uint&#160;</td>
          <td class="paramname"><em>grad_step_y</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">uint&#160;</td>
          <td class="paramname"><em>grad_offset_first_element_in_bytes</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">__global uchar *&#160;</td>
          <td class="paramname"><em>angle_ptr</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">uint&#160;</td>
          <td class="paramname"><em>angle_stride_x</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">uint&#160;</td>
          <td class="paramname"><em>angle_step_x</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">uint&#160;</td>
          <td class="paramname"><em>angle_stride_y</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">uint&#160;</td>
          <td class="paramname"><em>angle_step_y</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">uint&#160;</td>
          <td class="paramname"><em>angle_offset_first_element_in_bytes</em>&#160;</td>
        </tr>
        <tr>
          <td></td>
          <td>)</td>
          <td></td><td></td>
        </tr>
      </table>
</div><div class="memdoc">

<p>Calculate the magnitude and phase from horizontal and vertical result of sobel result. </p>
<dl class="section note"><dt>Note</dt><dd>The calculation of gradient uses level 1 normalisation. </dd></dl>
<dl class="section attention"><dt>Attention</dt><dd>The input and output data types need to be passed at compile time using -DDATA_TYPE_IN and -DDATA_TYPE_OUT: e.g. -DDATA_TYPE_IN=uchar -DDATA_TYPE_OUT=short</dd></dl>
<dl class="params"><dt>Parameters</dt><dd>
  <table class="params">
    <tr><td class="paramdir">[in]</td><td class="paramname">src1_ptr</td><td>Pointer to the source image (Vertical result of Sobel). Supported data types: S16, S32 </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">src1_stride_x</td><td>Stride of the source image in X dimension (in bytes) </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">src1_step_x</td><td>src1_stride_x * number of elements along X processed per workitem(in bytes) </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">src1_stride_y</td><td>Stride of the source image in Y dimension (in bytes) </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">src1_step_y</td><td>src1_stride_y * number of elements along Y processed per workitem(in bytes) </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">src1_offset_first_element_in_bytes</td><td>The offset of the first element in the source image </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">src2_ptr</td><td>Pointer to the source image (Vertical result of Sobel). Supported data types: S16, S32 </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">src2_stride_x</td><td>Stride of the source image in X dimension (in bytes) </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">src2_step_x</td><td>src2_stride_x * number of elements along X processed per workitem(in bytes) </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">src2_stride_y</td><td>Stride of the source image in Y dimension (in bytes) </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">src2_step_y</td><td>src2_stride_y * number of elements along Y processed per workitem(in bytes) </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">src2_offset_first_element_in_bytes</td><td>The offset of the first element in the source image </td></tr>
    <tr><td class="paramdir">[out]</td><td class="paramname">grad_ptr</td><td>Pointer to the gradient output. Supported data types: U16, U32 </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">grad_stride_x</td><td>Stride of the source image in X dimension (in bytes) </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">grad_step_x</td><td>grad_stride_x * number of elements along X processed per workitem(in bytes) </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">grad_stride_y</td><td>Stride of the source image in Y dimension (in bytes) </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">grad_step_y</td><td>grad_stride_y * number of elements along Y processed per workitem(in bytes) </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">grad_offset_first_element_in_bytes</td><td>The offset of the first element of the output </td></tr>
    <tr><td class="paramdir">[out]</td><td class="paramname">angle_ptr</td><td>Pointer to the angle output. Supported data types: U8 </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">angle_stride_x</td><td>Stride of the source image in X dimension (in bytes) </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">angle_step_x</td><td>angle_stride_x * number of elements along X processed per workitem(in bytes) </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">angle_stride_y</td><td>Stride of the source image in Y dimension (in bytes) </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">angle_step_y</td><td>angle_stride_y * number of elements along Y processed per workitem(in bytes) </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">angle_offset_first_element_in_bytes</td><td>The offset of the first element of the output </td></tr>
  </table>
  </dd>
</dl>

<p>Definition at line <a class="el" href="canny_8cl_source.xhtml#l00057">57</a> of file <a class="el" href="canny_8cl_source.xhtml">canny.cl</a>.</p>

<p>References <a class="el" href="tests_2validation_2_fixed_point_8h_source.xhtml#l00914">arm_compute::test::fixed_point_arithmetic::detail::abs()</a>, <a class="el" href="direct__convolution1x1_8cl_source.xhtml#l00040">CONVERT_SAT</a>, <a class="el" href="helpers_8h_source.xhtml#l00096">CONVERT_TO_IMAGE_STRUCT</a>, <a class="el" href="convolution3x3_8cl_source.xhtml#l00031">DATA_TYPE_OUT</a>, <a class="el" href="helpers_8h_source.xhtml#l00136">Image::ptr</a>, and <a class="el" href="fixed__point_8h_source.xhtml#l00093">VEC_DATA_TYPE</a>.</p>
<div class="fragment"><div class="line"><a name="l00062"></a><span class="lineno">   62</span>&#160;{</div>
<div class="line"><a name="l00063"></a><span class="lineno">   63</span>&#160;    <span class="comment">// Construct images</span></div>
<div class="line"><a name="l00064"></a><span class="lineno">   64</span>&#160;    <a class="code" href="struct_image.xhtml">Image</a> src1  = <a class="code" href="helpers_8h.xhtml#aebe814363556c244be043b13e7969197">CONVERT_TO_IMAGE_STRUCT</a>(src1);</div>
<div class="line"><a name="l00065"></a><span class="lineno">   65</span>&#160;    <a class="code" href="struct_image.xhtml">Image</a> src2  = <a class="code" href="helpers_8h.xhtml#aebe814363556c244be043b13e7969197">CONVERT_TO_IMAGE_STRUCT</a>(src2);</div>
<div class="line"><a name="l00066"></a><span class="lineno">   66</span>&#160;    <a class="code" href="struct_image.xhtml">Image</a> grad  = <a class="code" href="helpers_8h.xhtml#aebe814363556c244be043b13e7969197">CONVERT_TO_IMAGE_STRUCT</a>(grad);</div>
<div class="line"><a name="l00067"></a><span class="lineno">   67</span>&#160;    <a class="code" href="struct_image.xhtml">Image</a> angle = <a class="code" href="helpers_8h.xhtml#aebe814363556c244be043b13e7969197">CONVERT_TO_IMAGE_STRUCT</a>(angle);</div>
<div class="line"><a name="l00068"></a><span class="lineno">   68</span>&#160;</div>
<div class="line"><a name="l00069"></a><span class="lineno">   69</span>&#160;    <span class="comment">// Load sobel horizontal and vertical values</span></div>
<div class="line"><a name="l00070"></a><span class="lineno">   70</span>&#160;    <a class="code" href="fixed__point_8h.xhtml#a36f754c05b6fddf6df0d8d0a74f8159f">VEC_DATA_TYPE</a>(DATA_TYPE_IN, 4)</div>
<div class="line"><a name="l00071"></a><span class="lineno">   71</span>&#160;    h = vload4(0, (__global DATA_TYPE_IN *)src1.ptr);</div>
<div class="line"><a name="l00072"></a><span class="lineno">   72</span>&#160;    <a class="code" href="fixed__point_8h.xhtml#a36f754c05b6fddf6df0d8d0a74f8159f">VEC_DATA_TYPE</a>(DATA_TYPE_IN, 4)</div>
<div class="line"><a name="l00073"></a><span class="lineno">   73</span>&#160;    v = vload4(0, (__global DATA_TYPE_IN *)src2.ptr);</div>
<div class="line"><a name="l00074"></a><span class="lineno">   74</span>&#160;</div>
<div class="line"><a name="l00075"></a><span class="lineno">   75</span>&#160;    <span class="comment">/* Calculate the gradient, using level 1 normalisation method */</span></div>
<div class="line"><a name="l00076"></a><span class="lineno">   76</span>&#160;    <a class="code" href="fixed__point_8h.xhtml#a36f754c05b6fddf6df0d8d0a74f8159f">VEC_DATA_TYPE</a>(<a class="code" href="convolution3x3_8cl.xhtml#ac06f3e24d3fffd3c465d8b2a6e7c985e">DATA_TYPE_OUT</a>, 4)</div>
<div class="line"><a name="l00077"></a><span class="lineno">   77</span>&#160;    m = <a class="code" href="direct__convolution1x1_8cl.xhtml#a1f15728672380ade7a238f5e783d54d2">CONVERT_SAT</a>((<a class="code" href="namespacearm__compute_1_1test_1_1fixed__point__arithmetic_1_1detail.xhtml#ae115fc750a92fb6a5e094998b56fcc56">abs</a>(h) + <a class="code" href="namespacearm__compute_1_1test_1_1fixed__point__arithmetic_1_1detail.xhtml#ae115fc750a92fb6a5e094998b56fcc56">abs</a>(v)), <a class="code" href="fixed__point_8h.xhtml#a36f754c05b6fddf6df0d8d0a74f8159f">VEC_DATA_TYPE</a>(DATA_TYPE_OUT, 4));</div>
<div class="line"><a name="l00078"></a><span class="lineno">   78</span>&#160;</div>
<div class="line"><a name="l00079"></a><span class="lineno">   79</span>&#160;    <span class="comment">/* Calculate the angle */</span></div>
<div class="line"><a name="l00080"></a><span class="lineno">   80</span>&#160;    float4 p = atan2pi(convert_float4(v), convert_float4(h));</div>
<div class="line"><a name="l00081"></a><span class="lineno">   81</span>&#160;</div>
<div class="line"><a name="l00082"></a><span class="lineno">   82</span>&#160;    <span class="comment">/* Remap angle to range [0, 256) */</span></div>
<div class="line"><a name="l00083"></a><span class="lineno">   83</span>&#160;    p = select(p, p + 2, p &lt; 0.0f) * 128.0f;</div>
<div class="line"><a name="l00084"></a><span class="lineno">   84</span>&#160;</div>
<div class="line"><a name="l00085"></a><span class="lineno">   85</span>&#160;    <span class="comment">/* Store results */</span></div>
<div class="line"><a name="l00086"></a><span class="lineno">   86</span>&#160;    vstore4(m, 0, (__global DATA_TYPE_OUT *)grad.ptr);</div>
<div class="line"><a name="l00087"></a><span class="lineno">   87</span>&#160;    vstore4(convert_uchar4_sat_rte(p), 0, angle.ptr);</div>
<div class="line"><a name="l00088"></a><span class="lineno">   88</span>&#160;}</div>
<div class="ttc" id="direct__convolution1x1_8cl_xhtml_a1f15728672380ade7a238f5e783d54d2"><div class="ttname"><a href="direct__convolution1x1_8cl.xhtml#a1f15728672380ade7a238f5e783d54d2">CONVERT_SAT</a></div><div class="ttdeci">#define CONVERT_SAT(a, b)</div><div class="ttdef"><b>Definition:</b> <a href="direct__convolution1x1_8cl_source.xhtml#l00040">direct_convolution1x1.cl:40</a></div></div>
<div class="ttc" id="helpers_8h_xhtml_aebe814363556c244be043b13e7969197"><div class="ttname"><a href="helpers_8h.xhtml#aebe814363556c244be043b13e7969197">CONVERT_TO_IMAGE_STRUCT</a></div><div class="ttdeci">#define CONVERT_TO_IMAGE_STRUCT(name)</div><div class="ttdef"><b>Definition:</b> <a href="helpers_8h_source.xhtml#l00096">helpers.h:96</a></div></div>
<div class="ttc" id="struct_image_xhtml"><div class="ttname"><a href="struct_image.xhtml">Image</a></div><div class="ttdoc">Structure to hold Image information. </div><div class="ttdef"><b>Definition:</b> <a href="helpers_8h_source.xhtml#l00134">helpers.h:134</a></div></div>
<div class="ttc" id="fixed__point_8h_xhtml_a36f754c05b6fddf6df0d8d0a74f8159f"><div class="ttname"><a href="fixed__point_8h.xhtml#a36f754c05b6fddf6df0d8d0a74f8159f">VEC_DATA_TYPE</a></div><div class="ttdeci">#define VEC_DATA_TYPE(type, size)</div><div class="ttdef"><b>Definition:</b> <a href="fixed__point_8h_source.xhtml#l00093">fixed_point.h:93</a></div></div>
<div class="ttc" id="convolution3x3_8cl_xhtml_ac06f3e24d3fffd3c465d8b2a6e7c985e"><div class="ttname"><a href="convolution3x3_8cl.xhtml#ac06f3e24d3fffd3c465d8b2a6e7c985e">DATA_TYPE_OUT</a></div><div class="ttdeci">#define DATA_TYPE_OUT</div><div class="ttdef"><b>Definition:</b> <a href="convolution3x3_8cl_source.xhtml#l00031">convolution3x3.cl:31</a></div></div>
<div class="ttc" id="namespacearm__compute_1_1test_1_1fixed__point__arithmetic_1_1detail_xhtml_ae115fc750a92fb6a5e094998b56fcc56"><div class="ttname"><a href="namespacearm__compute_1_1test_1_1fixed__point__arithmetic_1_1detail.xhtml#ae115fc750a92fb6a5e094998b56fcc56">arm_compute::test::fixed_point_arithmetic::detail::abs</a></div><div class="ttdeci">fixed_point&lt; T &gt; abs(fixed_point&lt; T &gt; x)</div><div class="ttdef"><b>Definition:</b> <a href="tests_2validation_2_fixed_point_8h_source.xhtml#l00914">FixedPoint.h:914</a></div></div>
</div><!-- fragment -->
</div>
</div>
<a class="anchor" id="a7046357526e2f95a34e3ffa217752d9f"></a>
<div class="memitem">
<div class="memproto">
      <table class="memname">
        <tr>
          <td class="memname">__kernel void combine_gradients_L2 </td>
          <td>(</td>
          <td class="paramtype">__global uchar *&#160;</td>
          <td class="paramname"><em>src1_ptr</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">uint&#160;</td>
          <td class="paramname"><em>src1_stride_x</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">uint&#160;</td>
          <td class="paramname"><em>src1_step_x</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">uint&#160;</td>
          <td class="paramname"><em>src1_stride_y</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">uint&#160;</td>
          <td class="paramname"><em>src1_step_y</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">uint&#160;</td>
          <td class="paramname"><em>src1_offset_first_element_in_bytes</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">__global uchar *&#160;</td>
          <td class="paramname"><em>src2_ptr</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">uint&#160;</td>
          <td class="paramname"><em>src2_stride_x</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">uint&#160;</td>
          <td class="paramname"><em>src2_step_x</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">uint&#160;</td>
          <td class="paramname"><em>src2_stride_y</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">uint&#160;</td>
          <td class="paramname"><em>src2_step_y</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">uint&#160;</td>
          <td class="paramname"><em>src2_offset_first_element_in_bytes</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">__global uchar *&#160;</td>
          <td class="paramname"><em>grad_ptr</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">uint&#160;</td>
          <td class="paramname"><em>grad_stride_x</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">uint&#160;</td>
          <td class="paramname"><em>grad_step_x</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">uint&#160;</td>
          <td class="paramname"><em>grad_stride_y</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">uint&#160;</td>
          <td class="paramname"><em>grad_step_y</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">uint&#160;</td>
          <td class="paramname"><em>grad_offset_first_element_in_bytes</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">__global uchar *&#160;</td>
          <td class="paramname"><em>angle_ptr</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">uint&#160;</td>
          <td class="paramname"><em>angle_stride_x</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">uint&#160;</td>
          <td class="paramname"><em>angle_step_x</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">uint&#160;</td>
          <td class="paramname"><em>angle_stride_y</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">uint&#160;</td>
          <td class="paramname"><em>angle_step_y</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">uint&#160;</td>
          <td class="paramname"><em>angle_offset_first_element_in_bytes</em>&#160;</td>
        </tr>
        <tr>
          <td></td>
          <td>)</td>
          <td></td><td></td>
        </tr>
      </table>
</div><div class="memdoc">

<p>Calculate the gradient and angle from horizontal and vertical result of sobel result. </p>
<dl class="section note"><dt>Note</dt><dd>The calculation of gradient uses level 2 normalisation </dd></dl>
<dl class="section attention"><dt>Attention</dt><dd>The input and output data types need to be passed at compile time using -DDATA_TYPE_IN and -DDATA_TYPE_OUT: e.g. -DDATA_TYPE_IN=uchar -DDATA_TYPE_OUT=short</dd></dl>
<dl class="params"><dt>Parameters</dt><dd>
  <table class="params">
    <tr><td class="paramdir">[in]</td><td class="paramname">src1_ptr</td><td>Pointer to the source image (Vertical result of Sobel). Supported data types: S16, S32 </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">src1_stride_x</td><td>Stride of the source image in X dimension (in bytes) </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">src1_step_x</td><td>src1_stride_x * number of elements along X processed per workitem(in bytes) </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">src1_stride_y</td><td>Stride of the source image in Y dimension (in bytes) </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">src1_step_y</td><td>src1_stride_y * number of elements along Y processed per workitem(in bytes) </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">src1_offset_first_element_in_bytes</td><td>The offset of the first element in the source image </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">src2_ptr</td><td>Pointer to the source image (Vertical result of Sobel). Supported data types: S16, S32 </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">src2_stride_x</td><td>Stride of the source image in X dimension (in bytes) </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">src2_step_x</td><td>src2_stride_x * number of elements along X processed per workitem(in bytes) </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">src2_stride_y</td><td>Stride of the source image in Y dimension (in bytes) </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">src2_step_y</td><td>src2_stride_y * number of elements along Y processed per workitem(in bytes) </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">src2_offset_first_element_in_bytes</td><td>The offset of the first element in the source image </td></tr>
    <tr><td class="paramdir">[out]</td><td class="paramname">grad_ptr</td><td>Pointer to the gradient output. Supported data types: U16, U32 </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">grad_stride_x</td><td>Stride of the source image in X dimension (in bytes) </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">grad_step_x</td><td>grad_stride_x * number of elements along X processed per workitem(in bytes) </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">grad_stride_y</td><td>Stride of the source image in Y dimension (in bytes) </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">grad_step_y</td><td>grad_stride_y * number of elements along Y processed per workitem(in bytes) </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">grad_offset_first_element_in_bytes</td><td>The offset of the first element of the output </td></tr>
    <tr><td class="paramdir">[out]</td><td class="paramname">angle_ptr</td><td>Pointer to the angle output. Supported data types: U8 </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">angle_stride_x</td><td>Stride of the source image in X dimension (in bytes) </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">angle_step_x</td><td>angle_stride_x * number of elements along X processed per workitem(in bytes) </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">angle_stride_y</td><td>Stride of the source image in Y dimension (in bytes) </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">angle_step_y</td><td>angle_stride_y * number of elements along Y processed per workitem(in bytes) </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">angle_offset_first_element_in_bytes</td><td>The offset of the first element of the output </td></tr>
  </table>
  </dd>
</dl>

<p>Definition at line <a class="el" href="canny_8cl_source.xhtml#l00121">121</a> of file <a class="el" href="canny_8cl_source.xhtml">canny.cl</a>.</p>

<p>References <a class="el" href="helpers_8h_source.xhtml#l00052">CONVERT_SAT_ROUND</a>, <a class="el" href="helpers_8h_source.xhtml#l00096">CONVERT_TO_IMAGE_STRUCT</a>, <a class="el" href="convolution3x3_8cl_source.xhtml#l00031">DATA_TYPE_OUT</a>, <a class="el" href="helpers_8h_source.xhtml#l00136">Image::ptr</a>, and <a class="el" href="fixed__point_8h_source.xhtml#l00093">VEC_DATA_TYPE</a>.</p>
<div class="fragment"><div class="line"><a name="l00126"></a><span class="lineno">  126</span>&#160;{</div>
<div class="line"><a name="l00127"></a><span class="lineno">  127</span>&#160;    <span class="comment">// Construct images</span></div>
<div class="line"><a name="l00128"></a><span class="lineno">  128</span>&#160;    <a class="code" href="struct_image.xhtml">Image</a> src1  = <a class="code" href="helpers_8h.xhtml#aebe814363556c244be043b13e7969197">CONVERT_TO_IMAGE_STRUCT</a>(src1);</div>
<div class="line"><a name="l00129"></a><span class="lineno">  129</span>&#160;    <a class="code" href="struct_image.xhtml">Image</a> src2  = <a class="code" href="helpers_8h.xhtml#aebe814363556c244be043b13e7969197">CONVERT_TO_IMAGE_STRUCT</a>(src2);</div>
<div class="line"><a name="l00130"></a><span class="lineno">  130</span>&#160;    <a class="code" href="struct_image.xhtml">Image</a> grad  = <a class="code" href="helpers_8h.xhtml#aebe814363556c244be043b13e7969197">CONVERT_TO_IMAGE_STRUCT</a>(grad);</div>
<div class="line"><a name="l00131"></a><span class="lineno">  131</span>&#160;    <a class="code" href="struct_image.xhtml">Image</a> angle = <a class="code" href="helpers_8h.xhtml#aebe814363556c244be043b13e7969197">CONVERT_TO_IMAGE_STRUCT</a>(angle);</div>
<div class="line"><a name="l00132"></a><span class="lineno">  132</span>&#160;</div>
<div class="line"><a name="l00133"></a><span class="lineno">  133</span>&#160;    <span class="comment">// Load sobel horizontal and vertical values</span></div>
<div class="line"><a name="l00134"></a><span class="lineno">  134</span>&#160;    float4 h = convert_float4(vload4(0, (__global DATA_TYPE_IN *)src1.<a class="code" href="struct_image.xhtml#acf52c23cbd7424606c10a606524e3e32">ptr</a>));</div>
<div class="line"><a name="l00135"></a><span class="lineno">  135</span>&#160;    float4 v = convert_float4(vload4(0, (__global DATA_TYPE_IN *)src2.<a class="code" href="struct_image.xhtml#acf52c23cbd7424606c10a606524e3e32">ptr</a>));</div>
<div class="line"><a name="l00136"></a><span class="lineno">  136</span>&#160;</div>
<div class="line"><a name="l00137"></a><span class="lineno">  137</span>&#160;    <span class="comment">/* Calculate the gradient, using level 2 normalisation method */</span></div>
<div class="line"><a name="l00138"></a><span class="lineno">  138</span>&#160;    float4 m = sqrt(h * h + v * v);</div>
<div class="line"><a name="l00139"></a><span class="lineno">  139</span>&#160;</div>
<div class="line"><a name="l00140"></a><span class="lineno">  140</span>&#160;    <span class="comment">/* Calculate the angle */</span></div>
<div class="line"><a name="l00141"></a><span class="lineno">  141</span>&#160;    float4 p = atan2pi(v, h);</div>
<div class="line"><a name="l00142"></a><span class="lineno">  142</span>&#160;</div>
<div class="line"><a name="l00143"></a><span class="lineno">  143</span>&#160;    <span class="comment">/* Remap angle to range [0, 256) */</span></div>
<div class="line"><a name="l00144"></a><span class="lineno">  144</span>&#160;    p = select(p, p + 2, p &lt; 0.0f) * 128.0f;</div>
<div class="line"><a name="l00145"></a><span class="lineno">  145</span>&#160;</div>
<div class="line"><a name="l00146"></a><span class="lineno">  146</span>&#160;    <span class="comment">/* Store results */</span></div>
<div class="line"><a name="l00147"></a><span class="lineno">  147</span>&#160;    vstore4(<a class="code" href="helpers_8h.xhtml#a28b2b123792a5b11a32cb05a6d327437">CONVERT_SAT_ROUND</a>(m, <a class="code" href="fixed__point_8h.xhtml#a36f754c05b6fddf6df0d8d0a74f8159f">VEC_DATA_TYPE</a>(<a class="code" href="convolution3x3_8cl.xhtml#ac06f3e24d3fffd3c465d8b2a6e7c985e">DATA_TYPE_OUT</a>, 4), rte), 0, (__global <a class="code" href="convolution3x3_8cl.xhtml#ac06f3e24d3fffd3c465d8b2a6e7c985e">DATA_TYPE_OUT</a> *)grad.<a class="code" href="struct_image.xhtml#acf52c23cbd7424606c10a606524e3e32">ptr</a>);</div>
<div class="line"><a name="l00148"></a><span class="lineno">  148</span>&#160;    vstore4(convert_uchar4_sat_rte(p), 0, angle.<a class="code" href="struct_image.xhtml#acf52c23cbd7424606c10a606524e3e32">ptr</a>);</div>
<div class="line"><a name="l00149"></a><span class="lineno">  149</span>&#160;}</div>
<div class="ttc" id="helpers_8h_xhtml_aebe814363556c244be043b13e7969197"><div class="ttname"><a href="helpers_8h.xhtml#aebe814363556c244be043b13e7969197">CONVERT_TO_IMAGE_STRUCT</a></div><div class="ttdeci">#define CONVERT_TO_IMAGE_STRUCT(name)</div><div class="ttdef"><b>Definition:</b> <a href="helpers_8h_source.xhtml#l00096">helpers.h:96</a></div></div>
<div class="ttc" id="struct_image_xhtml"><div class="ttname"><a href="struct_image.xhtml">Image</a></div><div class="ttdoc">Structure to hold Image information. </div><div class="ttdef"><b>Definition:</b> <a href="helpers_8h_source.xhtml#l00134">helpers.h:134</a></div></div>
<div class="ttc" id="struct_image_xhtml_acf52c23cbd7424606c10a606524e3e32"><div class="ttname"><a href="struct_image.xhtml#acf52c23cbd7424606c10a606524e3e32">Image::ptr</a></div><div class="ttdeci">__global uchar * ptr</div><div class="ttdoc">Pointer to the starting postion of the buffer. </div><div class="ttdef"><b>Definition:</b> <a href="helpers_8h_source.xhtml#l00136">helpers.h:136</a></div></div>
<div class="ttc" id="helpers_8h_xhtml_a28b2b123792a5b11a32cb05a6d327437"><div class="ttname"><a href="helpers_8h.xhtml#a28b2b123792a5b11a32cb05a6d327437">CONVERT_SAT_ROUND</a></div><div class="ttdeci">#define CONVERT_SAT_ROUND(x, type, round)</div><div class="ttdef"><b>Definition:</b> <a href="helpers_8h_source.xhtml#l00052">helpers.h:52</a></div></div>
<div class="ttc" id="fixed__point_8h_xhtml_a36f754c05b6fddf6df0d8d0a74f8159f"><div class="ttname"><a href="fixed__point_8h.xhtml#a36f754c05b6fddf6df0d8d0a74f8159f">VEC_DATA_TYPE</a></div><div class="ttdeci">#define VEC_DATA_TYPE(type, size)</div><div class="ttdef"><b>Definition:</b> <a href="fixed__point_8h_source.xhtml#l00093">fixed_point.h:93</a></div></div>
<div class="ttc" id="convolution3x3_8cl_xhtml_ac06f3e24d3fffd3c465d8b2a6e7c985e"><div class="ttname"><a href="convolution3x3_8cl.xhtml#ac06f3e24d3fffd3c465d8b2a6e7c985e">DATA_TYPE_OUT</a></div><div class="ttdeci">#define DATA_TYPE_OUT</div><div class="ttdef"><b>Definition:</b> <a href="convolution3x3_8cl_source.xhtml#l00031">convolution3x3.cl:31</a></div></div>
</div><!-- fragment -->
</div>
</div>
<a class="anchor" id="acd62ae1c9f3d7a1c7e49499d308d1904"></a>
<div class="memitem">
<div class="memproto">
      <table class="memname">
        <tr>
          <td class="memname">kernel void hysteresis </td>
          <td>(</td>
          <td class="paramtype">__global uchar *&#160;</td>
          <td class="paramname"><em>src_ptr</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">uint&#160;</td>
          <td class="paramname"><em>src_stride_x</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">uint&#160;</td>
          <td class="paramname"><em>src_step_x</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">uint&#160;</td>
          <td class="paramname"><em>src_stride_y</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">uint&#160;</td>
          <td class="paramname"><em>src_step_y</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">uint&#160;</td>
          <td class="paramname"><em>src_offset_first_element_in_bytes</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">__global uchar *&#160;</td>
          <td class="paramname"><em>out_ptr</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">uint&#160;</td>
          <td class="paramname"><em>out_stride_x</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">uint&#160;</td>
          <td class="paramname"><em>out_step_x</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">uint&#160;</td>
          <td class="paramname"><em>out_stride_y</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">uint&#160;</td>
          <td class="paramname"><em>out_step_y</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">uint&#160;</td>
          <td class="paramname"><em>out_offset_first_element_in_bytes</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">__global uchar *&#160;</td>
          <td class="paramname"><em>visited_ptr</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">uint&#160;</td>
          <td class="paramname"><em>visited_stride_x</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">uint&#160;</td>
          <td class="paramname"><em>visited_step_x</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">uint&#160;</td>
          <td class="paramname"><em>visited_stride_y</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">uint&#160;</td>
          <td class="paramname"><em>visited_step_y</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">uint&#160;</td>
          <td class="paramname"><em>visited_offset_first_element_in_bytes</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">__global uchar *&#160;</td>
          <td class="paramname"><em>recorded_ptr</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">uint&#160;</td>
          <td class="paramname"><em>recorded_stride_x</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">uint&#160;</td>
          <td class="paramname"><em>recorded_step_x</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">uint&#160;</td>
          <td class="paramname"><em>recorded_stride_y</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">uint&#160;</td>
          <td class="paramname"><em>recorded_step_y</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">uint&#160;</td>
          <td class="paramname"><em>recorded_offset_first_element_in_bytes</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">__global uchar *&#160;</td>
          <td class="paramname"><em>l1_stack_ptr</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">uint&#160;</td>
          <td class="paramname"><em>l1_stack_stride_x</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">uint&#160;</td>
          <td class="paramname"><em>l1_stack_step_x</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">uint&#160;</td>
          <td class="paramname"><em>l1_stack_stride_y</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">uint&#160;</td>
          <td class="paramname"><em>l1_stack_step_y</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">uint&#160;</td>
          <td class="paramname"><em>l1_stack_offset_first_element_in_bytes</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">__global uchar *&#160;</td>
          <td class="paramname"><em>l1_stack_counter_ptr</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">uint&#160;</td>
          <td class="paramname"><em>l1_stack_counter_stride_x</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">uint&#160;</td>
          <td class="paramname"><em>l1_stack_counter_step_x</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">uint&#160;</td>
          <td class="paramname"><em>l1_stack_counter_stride_y</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">uint&#160;</td>
          <td class="paramname"><em>l1_stack_counter_step_y</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">uint&#160;</td>
          <td class="paramname"><em>l1_stack_counter_offset_first_element_in_bytes</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">uint&#160;</td>
          <td class="paramname"><em>low_thr</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">uint&#160;</td>
          <td class="paramname"><em>up_thr</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">int&#160;</td>
          <td class="paramname"><em>width</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">int&#160;</td>
          <td class="paramname"><em>height</em>&#160;</td>
        </tr>
        <tr>
          <td></td>
          <td>)</td>
          <td></td><td></td>
        </tr>
      </table>
</div><div class="memdoc">

<p>Perform hysteresis. </p>
<dl class="section attention"><dt>Attention</dt><dd>The input data_type needs to be passed at compile time using -DDATA_TYPE_IN: e.g. -DDATA_TYPE_IN=short</dd></dl>
<dl class="params"><dt>Parameters</dt><dd>
  <table class="params">
    <tr><td class="paramdir">[in]</td><td class="paramname">src_ptr</td><td>Pointer to the input image. Supported data types: U8 </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">src_stride_x</td><td>Stride of the source image in X dimension (in bytes) </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">src_step_x</td><td>src_stride_x * number of elements along X processed per workitem(in bytes) </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">src_stride_y</td><td>Stride of the source image in Y dimension (in bytes) </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">src_step_y</td><td>src_stride_y * number of elements along Y processed per workitem(in bytes) </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">src_offset_first_element_in_bytes</td><td>The offset of the first element of the output </td></tr>
    <tr><td class="paramdir">[out]</td><td class="paramname">out_ptr</td><td>Pointer to the output image. Supported data types: U8 </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">out_stride_x</td><td>Stride of the source image in X dimension (in bytes) </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">out_step_x</td><td>out_stride_x * number of elements along X processed per workitem(in bytes) </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">out_stride_y</td><td>Stride of the source image in Y dimension (in bytes) </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">out_step_y</td><td>out_stride_y * number of elements along Y processed per workitem(in bytes) </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">out_offset_first_element_in_bytes</td><td>The offset of the first element of the output </td></tr>
    <tr><td class="paramdir">[out]</td><td class="paramname">visited_ptr</td><td>Pointer to the visited buffer, where pixels are marked as visited. Supported data types: U32 </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">visited_stride_x</td><td>Stride of the source image in X dimension (in bytes) </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">visited_step_x</td><td>visited_stride_x * number of elements along X processed per workitem(in bytes) </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">visited_stride_y</td><td>Stride of the source image in Y dimension (in bytes) </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">visited_step_y</td><td>visited_stride_y * number of elements along Y processed per workitem(in bytes) </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">visited_offset_first_element_in_bytes</td><td>The offset of the first element of the output </td></tr>
    <tr><td class="paramdir">[out]</td><td class="paramname">recorded_ptr</td><td>Pointer to the recorded buffer, where pixels are marked as recorded. Supported data types: U32 </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">recorded_stride_x</td><td>Stride of the source image in X dimension (in bytes) </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">recorded_step_x</td><td>recorded_stride_x * number of elements along X processed per workitem(in bytes) </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">recorded_stride_y</td><td>Stride of the source image in Y dimension (in bytes) </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">recorded_step_y</td><td>recorded_stride_y * number of elements along Y processed per workitem(in bytes) </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">recorded_offset_first_element_in_bytes</td><td>The offset of the first element of the output </td></tr>
    <tr><td class="paramdir">[out]</td><td class="paramname">l1_stack_ptr</td><td>Pointer to the l1 stack of a pixel. Supported data types: S32 </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">l1_stack_stride_x</td><td>Stride of the source image in X dimension (in bytes) </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">l1_stack_step_x</td><td>l1_stack_stride_x * number of elements along X processed per workitem(in bytes) </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">l1_stack_stride_y</td><td>Stride of the source image in Y dimension (in bytes) </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">l1_stack_step_y</td><td>l1_stack_stride_y * number of elements along Y processed per workitem(in bytes) </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">l1_stack_offset_first_element_in_bytes</td><td>The offset of the first element of the output </td></tr>
    <tr><td class="paramdir">[out]</td><td class="paramname">l1_stack_counter_ptr</td><td>Pointer to the l1 stack counters of an image. Supported data types: U8 </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">l1_stack_counter_stride_x</td><td>Stride of the source image in X dimension (in bytes) </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">l1_stack_counter_step_x</td><td>l1_stack_counter_stride_x * number of elements along X processed per workitem(in bytes) </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">l1_stack_counter_stride_y</td><td>Stride of the source image in Y dimension (in bytes) </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">l1_stack_counter_step_y</td><td>l1_stack_counter_stride_y * number of elements along Y processed per workitem(in bytes) </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">l1_stack_counter_offset_first_element_in_bytes</td><td>The offset of the first element of the output </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">low_thr</td><td>The lower threshold </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">up_thr</td><td>The upper threshold </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">width</td><td>The width of the image. </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">height</td><td>The height of the image </td></tr>
  </table>
  </dd>
</dl>

<p>Definition at line <a class="el" href="canny_8cl_source.xhtml#l00306">306</a> of file <a class="el" href="canny_8cl_source.xhtml">canny.cl</a>.</p>

<p>References <a class="el" href="canny_8cl_source.xhtml#l00242">check_pixel</a>, <a class="el" href="helpers_8h_source.xhtml#l00099">CONVERT_TO_IMAGE_STRUCT_NO_STEP</a>, <a class="el" href="canny_8cl_source.xhtml#l00227">EDGE</a>, <a class="el" href="canny_8cl_source.xhtml#l00228">hysteresis_local_stack_L1</a>, <a class="el" href="canny_8cl_source.xhtml#l00229">hysteresis_local_stack_L2</a>, <a class="el" href="tests_2validation_2_fixed_point_8h_source.xhtml#l00889">arm_compute::test::fixed_point_arithmetic::detail::max()</a>, <a class="el" href="tests_2validation_2_fixed_point_8h_source.xhtml#l00884">arm_compute::test::fixed_point_arithmetic::detail::min()</a>, <a class="el" href="helpers_8h_source.xhtml#l00295">offset()</a>, <a class="el" href="helpers_8h_source.xhtml#l00136">Image::ptr</a>, <a class="el" href="helpers_8h_source.xhtml#l00138">Image::stride_x</a>, <a class="el" href="helpers_8h_source.xhtml#l00139">Image::stride_y</a>, and <a class="el" href="fixed__point_8h_source.xhtml#l00093">VEC_DATA_TYPE</a>.</p>
<div class="fragment"><div class="line"><a name="l00317"></a><span class="lineno">  317</span>&#160;{</div>
<div class="line"><a name="l00318"></a><span class="lineno">  318</span>&#160;    <span class="comment">// Create images</span></div>
<div class="line"><a name="l00319"></a><span class="lineno">  319</span>&#160;    <a class="code" href="struct_image.xhtml">Image</a> src              = <a class="code" href="helpers_8h.xhtml#a4334a4a76f8e9628c0fb9e1acf616e2a">CONVERT_TO_IMAGE_STRUCT_NO_STEP</a>(src);</div>
<div class="line"><a name="l00320"></a><span class="lineno">  320</span>&#160;    <a class="code" href="struct_image.xhtml">Image</a> out              = <a class="code" href="helpers_8h.xhtml#a4334a4a76f8e9628c0fb9e1acf616e2a">CONVERT_TO_IMAGE_STRUCT_NO_STEP</a>(out);</div>
<div class="line"><a name="l00321"></a><span class="lineno">  321</span>&#160;    <a class="code" href="struct_image.xhtml">Image</a> visited          = <a class="code" href="helpers_8h.xhtml#a4334a4a76f8e9628c0fb9e1acf616e2a">CONVERT_TO_IMAGE_STRUCT_NO_STEP</a>(visited);</div>
<div class="line"><a name="l00322"></a><span class="lineno">  322</span>&#160;    <a class="code" href="struct_image.xhtml">Image</a> recorded         = <a class="code" href="helpers_8h.xhtml#a4334a4a76f8e9628c0fb9e1acf616e2a">CONVERT_TO_IMAGE_STRUCT_NO_STEP</a>(recorded);</div>
<div class="line"><a name="l00323"></a><span class="lineno">  323</span>&#160;    <a class="code" href="struct_image.xhtml">Image</a> l1_stack         = <a class="code" href="helpers_8h.xhtml#a4334a4a76f8e9628c0fb9e1acf616e2a">CONVERT_TO_IMAGE_STRUCT_NO_STEP</a>(l1_stack);</div>
<div class="line"><a name="l00324"></a><span class="lineno">  324</span>&#160;    <a class="code" href="struct_image.xhtml">Image</a> l1_stack_counter = <a class="code" href="helpers_8h.xhtml#a4334a4a76f8e9628c0fb9e1acf616e2a">CONVERT_TO_IMAGE_STRUCT_NO_STEP</a>(l1_stack_counter);</div>
<div class="line"><a name="l00325"></a><span class="lineno">  325</span>&#160;</div>
<div class="line"><a name="l00326"></a><span class="lineno">  326</span>&#160;    <span class="comment">// Index</span></div>
<div class="line"><a name="l00327"></a><span class="lineno">  327</span>&#160;    <span class="keywordtype">int</span> x = get_global_id(0);</div>
<div class="line"><a name="l00328"></a><span class="lineno">  328</span>&#160;    <span class="keywordtype">int</span> y = get_global_id(1);</div>
<div class="line"><a name="l00329"></a><span class="lineno">  329</span>&#160;</div>
<div class="line"><a name="l00330"></a><span class="lineno">  330</span>&#160;    <span class="comment">// Load value</span></div>
<div class="line"><a name="l00331"></a><span class="lineno">  331</span>&#160;    DATA_TYPE_IN val = *((__global DATA_TYPE_IN *)<a class="code" href="helpers_8h.xhtml#a009469e4d9b8fce3b6d5e97d2077827d">offset</a>(&amp;src, x, y));</div>
<div class="line"><a name="l00332"></a><span class="lineno">  332</span>&#160;</div>
<div class="line"><a name="l00333"></a><span class="lineno">  333</span>&#160;    <span class="comment">// If less than upper threshold set to NO_EDGE and return</span></div>
<div class="line"><a name="l00334"></a><span class="lineno">  334</span>&#160;    <span class="keywordflow">if</span>(val &lt;= up_thr)</div>
<div class="line"><a name="l00335"></a><span class="lineno">  335</span>&#160;    {</div>
<div class="line"><a name="l00336"></a><span class="lineno">  336</span>&#160;        *<a class="code" href="helpers_8h.xhtml#a009469e4d9b8fce3b6d5e97d2077827d">offset</a>(&amp;out, x, y) = 0;</div>
<div class="line"><a name="l00337"></a><span class="lineno">  337</span>&#160;        <span class="keywordflow">return</span>;</div>
<div class="line"><a name="l00338"></a><span class="lineno">  338</span>&#160;    }</div>
<div class="line"><a name="l00339"></a><span class="lineno">  339</span>&#160;</div>
<div class="line"><a name="l00340"></a><span class="lineno">  340</span>&#160;    <span class="comment">// Init local stack 2</span></div>
<div class="line"><a name="l00341"></a><span class="lineno">  341</span>&#160;    short2 stack_L2[<a class="code" href="canny_8cl.xhtml#aa55093fb165fb76898efb3ba80f62bae">hysteresis_local_stack_L2</a>] = { 0 };</div>
<div class="line"><a name="l00342"></a><span class="lineno">  342</span>&#160;    <span class="keywordtype">int</span>    L2_counter                          = 0;</div>
<div class="line"><a name="l00343"></a><span class="lineno">  343</span>&#160;</div>
<div class="line"><a name="l00344"></a><span class="lineno">  344</span>&#160;    <span class="comment">// Perform recursive hysteresis</span></div>
<div class="line"><a name="l00345"></a><span class="lineno">  345</span>&#160;    <span class="keywordflow">while</span>(<span class="keyword">true</span>)</div>
<div class="line"><a name="l00346"></a><span class="lineno">  346</span>&#160;    {</div>
<div class="line"><a name="l00347"></a><span class="lineno">  347</span>&#160;        <span class="comment">// Get L1 stack pointer</span></div>
<div class="line"><a name="l00348"></a><span class="lineno">  348</span>&#160;        __global short2 *l1_ptr = (__global short2 *)(l1_stack.<a class="code" href="struct_image.xhtml#acf52c23cbd7424606c10a606524e3e32">ptr</a> + y * l1_stack.<a class="code" href="struct_image.xhtml#a4f0b90c9ecd6e57ceb3f37332fefe8f1">stride_y</a> + x * <a class="code" href="canny_8cl.xhtml#a242e5ec23ae26cd2dfa5eab5ae68a0f1">hysteresis_local_stack_L1</a> * l1_stack.<a class="code" href="struct_image.xhtml#ae01febbfd0689ef709f3ff6fdd2abc7e">stride_x</a>);</div>
<div class="line"><a name="l00349"></a><span class="lineno">  349</span>&#160;</div>
<div class="line"><a name="l00350"></a><span class="lineno">  350</span>&#160;        <span class="comment">// If the pixel has already been visited, proceed with the items in the stack instead</span></div>
<div class="line"><a name="l00351"></a><span class="lineno">  351</span>&#160;        <span class="keywordflow">if</span>(atomic_or((__global uint *)<a class="code" href="helpers_8h.xhtml#a009469e4d9b8fce3b6d5e97d2077827d">offset</a>(&amp;visited, x, y), 1) != 0)</div>
<div class="line"><a name="l00352"></a><span class="lineno">  352</span>&#160;        {</div>
<div class="line"><a name="l00353"></a><span class="lineno">  353</span>&#160;            <span class="keywordflow">goto</span> pop_stack;</div>
<div class="line"><a name="l00354"></a><span class="lineno">  354</span>&#160;        }</div>
<div class="line"><a name="l00355"></a><span class="lineno">  355</span>&#160;</div>
<div class="line"><a name="l00356"></a><span class="lineno">  356</span>&#160;        <span class="comment">// Set strong edge</span></div>
<div class="line"><a name="l00357"></a><span class="lineno">  357</span>&#160;        *<a class="code" href="helpers_8h.xhtml#a009469e4d9b8fce3b6d5e97d2077827d">offset</a>(&amp;out, x, y) = <a class="code" href="canny_8cl.xhtml#ac243bfa96aa2c28014159ff098bd2324">EDGE</a>;</div>
<div class="line"><a name="l00358"></a><span class="lineno">  358</span>&#160;</div>
<div class="line"><a name="l00359"></a><span class="lineno">  359</span>&#160;        <span class="comment">// If it is the top of stack l2, we don&#39;t need check the surrounding pixels</span></div>
<div class="line"><a name="l00360"></a><span class="lineno">  360</span>&#160;        <span class="keywordflow">if</span>(L2_counter &gt; (<a class="code" href="canny_8cl.xhtml#aa55093fb165fb76898efb3ba80f62bae">hysteresis_local_stack_L2</a> - 1))</div>
<div class="line"><a name="l00361"></a><span class="lineno">  361</span>&#160;        {</div>
<div class="line"><a name="l00362"></a><span class="lineno">  362</span>&#160;            <span class="keywordflow">goto</span> pop_stack2;</div>
<div class="line"><a name="l00363"></a><span class="lineno">  363</span>&#160;        }</div>
<div class="line"><a name="l00364"></a><span class="lineno">  364</span>&#160;</div>
<div class="line"><a name="l00365"></a><span class="lineno">  365</span>&#160;        <span class="comment">// Points to the start of the local stack;</span></div>
<div class="line"><a name="l00366"></a><span class="lineno">  366</span>&#160;        <span class="keywordtype">char</span> c;</div>
<div class="line"><a name="l00367"></a><span class="lineno">  367</span>&#160;</div>
<div class="line"><a name="l00368"></a><span class="lineno">  368</span>&#160;        <a class="code" href="fixed__point_8h.xhtml#a36f754c05b6fddf6df0d8d0a74f8159f">VEC_DATA_TYPE</a>(DATA_TYPE_IN, 4)</div>
<div class="line"><a name="l00369"></a><span class="lineno">  369</span>&#160;        x_tmp;</div>
<div class="line"><a name="l00370"></a><span class="lineno">  370</span>&#160;        uint4 v_tmp;</div>
<div class="line"><a name="l00371"></a><span class="lineno">  371</span>&#160;</div>
<div class="line"><a name="l00372"></a><span class="lineno">  372</span>&#160;        <span class="comment">// Get direction pixel indices</span></div>
<div class="line"><a name="l00373"></a><span class="lineno">  373</span>&#160;        <span class="keywordtype">int</span> N = <a class="code" href="namespacearm__compute_1_1test_1_1fixed__point__arithmetic_1_1detail.xhtml#ad91bb73431b4de1f4946ed949d444849">max</a>(y - 1, 0), S = <a class="code" href="namespacearm__compute_1_1test_1_1fixed__point__arithmetic_1_1detail.xhtml#aabcf39e3917f842dbc5fbb0d802f24d5">min</a>(y + 1, height - 2), W = <a class="code" href="namespacearm__compute_1_1test_1_1fixed__point__arithmetic_1_1detail.xhtml#ad91bb73431b4de1f4946ed949d444849">max</a>(x - 1, 0), E = <a class="code" href="namespacearm__compute_1_1test_1_1fixed__point__arithmetic_1_1detail.xhtml#aabcf39e3917f842dbc5fbb0d802f24d5">min</a>(x + 1, width - 2);</div>
<div class="line"><a name="l00374"></a><span class="lineno">  374</span>&#160;</div>
<div class="line"><a name="l00375"></a><span class="lineno">  375</span>&#160;        <span class="comment">// Check 8 pixels around for week edges where low_thr &lt; val &lt;= up_thr</span></div>
<div class="line"><a name="l00376"></a><span class="lineno">  376</span>&#160;        x_tmp = vload4(0, (__global DATA_TYPE_IN *)<a class="code" href="helpers_8h.xhtml#a009469e4d9b8fce3b6d5e97d2077827d">offset</a>(&amp;src, W, N));</div>
<div class="line"><a name="l00377"></a><span class="lineno">  377</span>&#160;        v_tmp = vload4(0, (__global uint *)<a class="code" href="helpers_8h.xhtml#a009469e4d9b8fce3b6d5e97d2077827d">offset</a>(&amp;visited, W, N));</div>
<div class="line"><a name="l00378"></a><span class="lineno">  378</span>&#160;        <a class="code" href="canny_8cl.xhtml#a64ee229d1bcee88c8017356d5d485650">check_pixel</a>(((x_tmp.s0 &lt;= low_thr) || v_tmp.s0 || (x_tmp.s0 &gt; up_thr)), W, N, x, y); <span class="comment">// NW</span></div>
<div class="line"><a name="l00379"></a><span class="lineno">  379</span>&#160;        <a class="code" href="canny_8cl.xhtml#a64ee229d1bcee88c8017356d5d485650">check_pixel</a>(((x_tmp.s1 &lt;= low_thr) || v_tmp.s1 || (x_tmp.s1 &gt; up_thr)), x, N, x, y); <span class="comment">// N</span></div>
<div class="line"><a name="l00380"></a><span class="lineno">  380</span>&#160;        <a class="code" href="canny_8cl.xhtml#a64ee229d1bcee88c8017356d5d485650">check_pixel</a>(((x_tmp.s2 &lt;= low_thr) || v_tmp.s2 || (x_tmp.s2 &gt; up_thr)), E, N, x, y); <span class="comment">// NE</span></div>
<div class="line"><a name="l00381"></a><span class="lineno">  381</span>&#160;</div>
<div class="line"><a name="l00382"></a><span class="lineno">  382</span>&#160;        x_tmp = vload4(0, (__global DATA_TYPE_IN *)<a class="code" href="helpers_8h.xhtml#a009469e4d9b8fce3b6d5e97d2077827d">offset</a>(&amp;src, W, y));</div>
<div class="line"><a name="l00383"></a><span class="lineno">  383</span>&#160;        v_tmp = vload4(0, (__global uint *)<a class="code" href="helpers_8h.xhtml#a009469e4d9b8fce3b6d5e97d2077827d">offset</a>(&amp;visited, W, y));</div>
<div class="line"><a name="l00384"></a><span class="lineno">  384</span>&#160;        <a class="code" href="canny_8cl.xhtml#a64ee229d1bcee88c8017356d5d485650">check_pixel</a>(((x_tmp.s0 &lt;= low_thr) || v_tmp.s0 || (x_tmp.s0 &gt; up_thr)), W, y, x, y); <span class="comment">// W</span></div>
<div class="line"><a name="l00385"></a><span class="lineno">  385</span>&#160;        <a class="code" href="canny_8cl.xhtml#a64ee229d1bcee88c8017356d5d485650">check_pixel</a>(((x_tmp.s2 &lt;= low_thr) || v_tmp.s2 || (x_tmp.s2 &gt; up_thr)), E, y, x, y); <span class="comment">// E</span></div>
<div class="line"><a name="l00386"></a><span class="lineno">  386</span>&#160;</div>
<div class="line"><a name="l00387"></a><span class="lineno">  387</span>&#160;        x_tmp = vload4(0, (__global DATA_TYPE_IN *)<a class="code" href="helpers_8h.xhtml#a009469e4d9b8fce3b6d5e97d2077827d">offset</a>(&amp;src, W, S));</div>
<div class="line"><a name="l00388"></a><span class="lineno">  388</span>&#160;        v_tmp = vload4(0, (__global uint *)<a class="code" href="helpers_8h.xhtml#a009469e4d9b8fce3b6d5e97d2077827d">offset</a>(&amp;visited, W, S));</div>
<div class="line"><a name="l00389"></a><span class="lineno">  389</span>&#160;        <a class="code" href="canny_8cl.xhtml#a64ee229d1bcee88c8017356d5d485650">check_pixel</a>(((x_tmp.s0 &lt;= low_thr) || v_tmp.s0 || (x_tmp.s0 &gt; up_thr)), W, S, x, y); <span class="comment">// SW</span></div>
<div class="line"><a name="l00390"></a><span class="lineno">  390</span>&#160;        <a class="code" href="canny_8cl.xhtml#a64ee229d1bcee88c8017356d5d485650">check_pixel</a>(((x_tmp.s1 &lt;= low_thr) || v_tmp.s1 || (x_tmp.s1 &gt; up_thr)), x, S, x, y); <span class="comment">// S</span></div>
<div class="line"><a name="l00391"></a><span class="lineno">  391</span>&#160;        <a class="code" href="canny_8cl.xhtml#a64ee229d1bcee88c8017356d5d485650">check_pixel</a>(((x_tmp.s2 &lt;= low_thr) || v_tmp.s2 || (x_tmp.s2 &gt; up_thr)), E, S, x, y); <span class="comment">// SE</span></div>
<div class="line"><a name="l00392"></a><span class="lineno">  392</span>&#160;</div>
<div class="line"><a name="l00393"></a><span class="lineno">  393</span>&#160;<span class="preprocessor">#undef check_pixel</span></div>
<div class="line"><a name="l00394"></a><span class="lineno">  394</span>&#160;<span class="preprocessor"></span></div>
<div class="line"><a name="l00395"></a><span class="lineno">  395</span>&#160;pop_stack:</div>
<div class="line"><a name="l00396"></a><span class="lineno">  396</span>&#160;        c = *((__global <span class="keywordtype">char</span> *)<a class="code" href="helpers_8h.xhtml#a009469e4d9b8fce3b6d5e97d2077827d">offset</a>(&amp;l1_stack_counter, x, y));</div>
<div class="line"><a name="l00397"></a><span class="lineno">  397</span>&#160;</div>
<div class="line"><a name="l00398"></a><span class="lineno">  398</span>&#160;        <span class="keywordflow">if</span>(c &gt;= 1)</div>
<div class="line"><a name="l00399"></a><span class="lineno">  399</span>&#160;        {</div>
<div class="line"><a name="l00400"></a><span class="lineno">  400</span>&#160;            *((__global <span class="keywordtype">char</span> *)<a class="code" href="helpers_8h.xhtml#a009469e4d9b8fce3b6d5e97d2077827d">offset</a>(&amp;l1_stack_counter, x, y)) -= 1;</div>
<div class="line"><a name="l00401"></a><span class="lineno">  401</span>&#160;            int2 l_c = convert_int2(l1_ptr[c - 1]);</div>
<div class="line"><a name="l00402"></a><span class="lineno">  402</span>&#160;</div>
<div class="line"><a name="l00403"></a><span class="lineno">  403</span>&#160;            <span class="comment">// Push the current position into level 2 stack</span></div>
<div class="line"><a name="l00404"></a><span class="lineno">  404</span>&#160;            stack_L2[L2_counter].x = x;</div>
<div class="line"><a name="l00405"></a><span class="lineno">  405</span>&#160;            stack_L2[L2_counter].y = y;</div>
<div class="line"><a name="l00406"></a><span class="lineno">  406</span>&#160;</div>
<div class="line"><a name="l00407"></a><span class="lineno">  407</span>&#160;            x = l_c.x;</div>
<div class="line"><a name="l00408"></a><span class="lineno">  408</span>&#160;            y = l_c.y;</div>
<div class="line"><a name="l00409"></a><span class="lineno">  409</span>&#160;</div>
<div class="line"><a name="l00410"></a><span class="lineno">  410</span>&#160;            L2_counter++;</div>
<div class="line"><a name="l00411"></a><span class="lineno">  411</span>&#160;</div>
<div class="line"><a name="l00412"></a><span class="lineno">  412</span>&#160;            <span class="keywordflow">continue</span>;</div>
<div class="line"><a name="l00413"></a><span class="lineno">  413</span>&#160;        }</div>
<div class="line"><a name="l00414"></a><span class="lineno">  414</span>&#160;</div>
<div class="line"><a name="l00415"></a><span class="lineno">  415</span>&#160;        <span class="keywordflow">if</span>(L2_counter &gt; 0)</div>
<div class="line"><a name="l00416"></a><span class="lineno">  416</span>&#160;        {</div>
<div class="line"><a name="l00417"></a><span class="lineno">  417</span>&#160;            <span class="keywordflow">goto</span> pop_stack2;</div>
<div class="line"><a name="l00418"></a><span class="lineno">  418</span>&#160;        }</div>
<div class="line"><a name="l00419"></a><span class="lineno">  419</span>&#160;        <span class="keywordflow">else</span></div>
<div class="line"><a name="l00420"></a><span class="lineno">  420</span>&#160;        {</div>
<div class="line"><a name="l00421"></a><span class="lineno">  421</span>&#160;            <span class="keywordflow">return</span>;</div>
<div class="line"><a name="l00422"></a><span class="lineno">  422</span>&#160;        }</div>
<div class="line"><a name="l00423"></a><span class="lineno">  423</span>&#160;</div>
<div class="line"><a name="l00424"></a><span class="lineno">  424</span>&#160;pop_stack2:</div>
<div class="line"><a name="l00425"></a><span class="lineno">  425</span>&#160;        L2_counter--;</div>
<div class="line"><a name="l00426"></a><span class="lineno">  426</span>&#160;        x = stack_L2[L2_counter].x;</div>
<div class="line"><a name="l00427"></a><span class="lineno">  427</span>&#160;        y = stack_L2[L2_counter].y;</div>
<div class="line"><a name="l00428"></a><span class="lineno">  428</span>&#160;    };</div>
<div class="line"><a name="l00429"></a><span class="lineno">  429</span>&#160;}</div>
<div class="ttc" id="canny_8cl_xhtml_a242e5ec23ae26cd2dfa5eab5ae68a0f1"><div class="ttname"><a href="canny_8cl.xhtml#a242e5ec23ae26cd2dfa5eab5ae68a0f1">hysteresis_local_stack_L1</a></div><div class="ttdeci">#define hysteresis_local_stack_L1</div><div class="ttdef"><b>Definition:</b> <a href="canny_8cl_source.xhtml#l00228">canny.cl:228</a></div></div>
<div class="ttc" id="namespacearm__compute_1_1test_1_1fixed__point__arithmetic_1_1detail_xhtml_aabcf39e3917f842dbc5fbb0d802f24d5"><div class="ttname"><a href="namespacearm__compute_1_1test_1_1fixed__point__arithmetic_1_1detail.xhtml#aabcf39e3917f842dbc5fbb0d802f24d5">arm_compute::test::fixed_point_arithmetic::detail::min</a></div><div class="ttdeci">fixed_point&lt; T &gt; min(fixed_point&lt; T &gt; x, fixed_point&lt; T &gt; y)</div><div class="ttdef"><b>Definition:</b> <a href="tests_2validation_2_fixed_point_8h_source.xhtml#l00884">FixedPoint.h:884</a></div></div>
<div class="ttc" id="helpers_8h_xhtml_a4334a4a76f8e9628c0fb9e1acf616e2a"><div class="ttname"><a href="helpers_8h.xhtml#a4334a4a76f8e9628c0fb9e1acf616e2a">CONVERT_TO_IMAGE_STRUCT_NO_STEP</a></div><div class="ttdeci">#define CONVERT_TO_IMAGE_STRUCT_NO_STEP(name)</div><div class="ttdef"><b>Definition:</b> <a href="helpers_8h_source.xhtml#l00099">helpers.h:99</a></div></div>
<div class="ttc" id="helpers_8h_xhtml_a009469e4d9b8fce3b6d5e97d2077827d"><div class="ttname"><a href="helpers_8h.xhtml#a009469e4d9b8fce3b6d5e97d2077827d">offset</a></div><div class="ttdeci">__global uchar * offset(const Image *img, int x, int y)</div><div class="ttdoc">Get the pointer position of a Image. </div><div class="ttdef"><b>Definition:</b> <a href="helpers_8h_source.xhtml#l00295">helpers.h:295</a></div></div>
<div class="ttc" id="canny_8cl_xhtml_ac243bfa96aa2c28014159ff098bd2324"><div class="ttname"><a href="canny_8cl.xhtml#ac243bfa96aa2c28014159ff098bd2324">EDGE</a></div><div class="ttdeci">#define EDGE</div><div class="ttdef"><b>Definition:</b> <a href="canny_8cl_source.xhtml#l00227">canny.cl:227</a></div></div>
<div class="ttc" id="struct_image_xhtml"><div class="ttname"><a href="struct_image.xhtml">Image</a></div><div class="ttdoc">Structure to hold Image information. </div><div class="ttdef"><b>Definition:</b> <a href="helpers_8h_source.xhtml#l00134">helpers.h:134</a></div></div>
<div class="ttc" id="struct_image_xhtml_acf52c23cbd7424606c10a606524e3e32"><div class="ttname"><a href="struct_image.xhtml#acf52c23cbd7424606c10a606524e3e32">Image::ptr</a></div><div class="ttdeci">__global uchar * ptr</div><div class="ttdoc">Pointer to the starting postion of the buffer. </div><div class="ttdef"><b>Definition:</b> <a href="helpers_8h_source.xhtml#l00136">helpers.h:136</a></div></div>
<div class="ttc" id="fixed__point_8h_xhtml_a36f754c05b6fddf6df0d8d0a74f8159f"><div class="ttname"><a href="fixed__point_8h.xhtml#a36f754c05b6fddf6df0d8d0a74f8159f">VEC_DATA_TYPE</a></div><div class="ttdeci">#define VEC_DATA_TYPE(type, size)</div><div class="ttdef"><b>Definition:</b> <a href="fixed__point_8h_source.xhtml#l00093">fixed_point.h:93</a></div></div>
<div class="ttc" id="canny_8cl_xhtml_a64ee229d1bcee88c8017356d5d485650"><div class="ttname"><a href="canny_8cl.xhtml#a64ee229d1bcee88c8017356d5d485650">check_pixel</a></div><div class="ttdeci">#define check_pixel(early_test, x_pos, y_pos, x_cur, y_cur)</div><div class="ttdoc">Check whether pixel is valid. </div><div class="ttdef"><b>Definition:</b> <a href="canny_8cl_source.xhtml#l00242">canny.cl:242</a></div></div>
<div class="ttc" id="canny_8cl_xhtml_aa55093fb165fb76898efb3ba80f62bae"><div class="ttname"><a href="canny_8cl.xhtml#aa55093fb165fb76898efb3ba80f62bae">hysteresis_local_stack_L2</a></div><div class="ttdeci">#define hysteresis_local_stack_L2</div><div class="ttdef"><b>Definition:</b> <a href="canny_8cl_source.xhtml#l00229">canny.cl:229</a></div></div>
<div class="ttc" id="namespacearm__compute_1_1test_1_1fixed__point__arithmetic_1_1detail_xhtml_ad91bb73431b4de1f4946ed949d444849"><div class="ttname"><a href="namespacearm__compute_1_1test_1_1fixed__point__arithmetic_1_1detail.xhtml#ad91bb73431b4de1f4946ed949d444849">arm_compute::test::fixed_point_arithmetic::detail::max</a></div><div class="ttdeci">fixed_point&lt; T &gt; max(fixed_point&lt; T &gt; x, fixed_point&lt; T &gt; y)</div><div class="ttdef"><b>Definition:</b> <a href="tests_2validation_2_fixed_point_8h_source.xhtml#l00889">FixedPoint.h:889</a></div></div>
<div class="ttc" id="struct_image_xhtml_a4f0b90c9ecd6e57ceb3f37332fefe8f1"><div class="ttname"><a href="struct_image.xhtml#a4f0b90c9ecd6e57ceb3f37332fefe8f1">Image::stride_y</a></div><div class="ttdeci">int stride_y</div><div class="ttdoc">Stride of the image in Y dimension (in bytes) </div><div class="ttdef"><b>Definition:</b> <a href="helpers_8h_source.xhtml#l00139">helpers.h:139</a></div></div>
<div class="ttc" id="struct_image_xhtml_ae01febbfd0689ef709f3ff6fdd2abc7e"><div class="ttname"><a href="struct_image.xhtml#ae01febbfd0689ef709f3ff6fdd2abc7e">Image::stride_x</a></div><div class="ttdeci">int stride_x</div><div class="ttdoc">Stride of the image in X dimension (in bytes) </div><div class="ttdef"><b>Definition:</b> <a href="helpers_8h_source.xhtml#l00138">helpers.h:138</a></div></div>
</div><!-- fragment -->
</div>
</div>
<a class="anchor" id="a8c233c75ee1010bcec8601d559f4be68"></a>
<div class="memitem">
<div class="memproto">
      <table class="memname">
        <tr>
          <td class="memname">__kernel void suppress_non_maximum </td>
          <td>(</td>
          <td class="paramtype">__global uchar *&#160;</td>
          <td class="paramname"><em>grad_ptr</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">uint&#160;</td>
          <td class="paramname"><em>grad_stride_x</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">uint&#160;</td>
          <td class="paramname"><em>grad_step_x</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">uint&#160;</td>
          <td class="paramname"><em>grad_stride_y</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">uint&#160;</td>
          <td class="paramname"><em>grad_step_y</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">uint&#160;</td>
          <td class="paramname"><em>grad_offset_first_element_in_bytes</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">__global uchar *&#160;</td>
          <td class="paramname"><em>angle_ptr</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">uint&#160;</td>
          <td class="paramname"><em>angle_stride_x</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">uint&#160;</td>
          <td class="paramname"><em>angle_step_x</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">uint&#160;</td>
          <td class="paramname"><em>angle_stride_y</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">uint&#160;</td>
          <td class="paramname"><em>angle_step_y</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">uint&#160;</td>
          <td class="paramname"><em>angle_offset_first_element_in_bytes</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">__global uchar *&#160;</td>
          <td class="paramname"><em>non_max_ptr</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">uint&#160;</td>
          <td class="paramname"><em>non_max_stride_x</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">uint&#160;</td>
          <td class="paramname"><em>non_max_step_x</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">uint&#160;</td>
          <td class="paramname"><em>non_max_stride_y</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">uint&#160;</td>
          <td class="paramname"><em>non_max_step_y</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">uint&#160;</td>
          <td class="paramname"><em>non_max_offset_first_element_in_bytes</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">uint&#160;</td>
          <td class="paramname"><em>lower_thr</em>&#160;</td>
        </tr>
        <tr>
          <td></td>
          <td>)</td>
          <td></td><td></td>
        </tr>
      </table>
</div><div class="memdoc">

<p>Perform non maximum suppression. </p>
<dl class="section attention"><dt>Attention</dt><dd>The input and output data types need to be passed at compile time using -DDATA_TYPE_IN and -DDATA_TYPE_OUT: e.g. -DDATA_TYPE_IN=uchar -DDATA_TYPE_OUT=short</dd></dl>
<dl class="params"><dt>Parameters</dt><dd>
  <table class="params">
    <tr><td class="paramdir">[in]</td><td class="paramname">grad_ptr</td><td>Pointer to the gradient output. Supported data types: S16, S32 </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">grad_stride_x</td><td>Stride of the source image in X dimension (in bytes) </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">grad_step_x</td><td>grad_stride_x * number of elements along X processed per workitem(in bytes) </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">grad_stride_y</td><td>Stride of the source image in Y dimension (in bytes) </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">grad_step_y</td><td>grad_stride_y * number of elements along Y processed per workitem(in bytes) </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">grad_offset_first_element_in_bytes</td><td>The offset of the first element of the output </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">angle_ptr</td><td>Pointer to the angle output. Supported data types: U8 </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">angle_stride_x</td><td>Stride of the source image in X dimension (in bytes) </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">angle_step_x</td><td>angle_stride_x * number of elements along X processed per workitem(in bytes) </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">angle_stride_y</td><td>Stride of the source image in Y dimension (in bytes) </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">angle_step_y</td><td>angle_stride_y * number of elements along Y processed per workitem(in bytes) </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">angle_offset_first_element_in_bytes</td><td>TThe offset of the first element of the output </td></tr>
    <tr><td class="paramdir">[out]</td><td class="paramname">non_max_ptr</td><td>Pointer to the non maximum suppressed output. Supported data types: U16, U32 </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">non_max_stride_x</td><td>Stride of the source image in X dimension (in bytes) </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">non_max_step_x</td><td>non_max_stride_x * number of elements along X processed per workitem(in bytes) </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">non_max_stride_y</td><td>Stride of the source image in Y dimension (in bytes) </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">non_max_step_y</td><td>non_max_stride_y * number of elements along Y processed per workitem(in bytes) </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">non_max_offset_first_element_in_bytes</td><td>The offset of the first element of the output </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">lower_thr</td><td>The low threshold </td></tr>
  </table>
  </dd>
</dl>

<p>Definition at line <a class="el" href="canny_8cl_source.xhtml#l00191">191</a> of file <a class="el" href="canny_8cl_source.xhtml">canny.cl</a>.</p>

<p>References <a class="el" href="helpers_8h_source.xhtml#l00096">CONVERT_TO_IMAGE_STRUCT</a>, <a class="el" href="convolution3x3_8cl_source.xhtml#l00031">DATA_TYPE_OUT</a>, <a class="el" href="helpers_8h_source.xhtml#l00295">offset()</a>, and <a class="el" href="helpers_8h_source.xhtml#l00136">Image::ptr</a>.</p>
<div class="fragment"><div class="line"><a name="l00196"></a><span class="lineno">  196</span>&#160;{</div>
<div class="line"><a name="l00197"></a><span class="lineno">  197</span>&#160;    <span class="comment">// Construct images</span></div>
<div class="line"><a name="l00198"></a><span class="lineno">  198</span>&#160;    <a class="code" href="struct_image.xhtml">Image</a> grad    = <a class="code" href="helpers_8h.xhtml#aebe814363556c244be043b13e7969197">CONVERT_TO_IMAGE_STRUCT</a>(grad);</div>
<div class="line"><a name="l00199"></a><span class="lineno">  199</span>&#160;    <a class="code" href="struct_image.xhtml">Image</a> angle   = <a class="code" href="helpers_8h.xhtml#aebe814363556c244be043b13e7969197">CONVERT_TO_IMAGE_STRUCT</a>(angle);</div>
<div class="line"><a name="l00200"></a><span class="lineno">  200</span>&#160;    <a class="code" href="struct_image.xhtml">Image</a> non_max = <a class="code" href="helpers_8h.xhtml#aebe814363556c244be043b13e7969197">CONVERT_TO_IMAGE_STRUCT</a>(non_max);</div>
<div class="line"><a name="l00201"></a><span class="lineno">  201</span>&#160;</div>
<div class="line"><a name="l00202"></a><span class="lineno">  202</span>&#160;    <span class="comment">// Get gradient and angle</span></div>
<div class="line"><a name="l00203"></a><span class="lineno">  203</span>&#160;    DATA_TYPE_IN gradient = *((__global DATA_TYPE_IN *)grad.<a class="code" href="struct_image.xhtml#acf52c23cbd7424606c10a606524e3e32">ptr</a>);</div>
<div class="line"><a name="l00204"></a><span class="lineno">  204</span>&#160;    uchar an              = convert_ushort(*angle.<a class="code" href="struct_image.xhtml#acf52c23cbd7424606c10a606524e3e32">ptr</a>);</div>
<div class="line"><a name="l00205"></a><span class="lineno">  205</span>&#160;</div>
<div class="line"><a name="l00206"></a><span class="lineno">  206</span>&#160;    <span class="keywordflow">if</span>(gradient &lt;= lower_thr)</div>
<div class="line"><a name="l00207"></a><span class="lineno">  207</span>&#160;    {</div>
<div class="line"><a name="l00208"></a><span class="lineno">  208</span>&#160;        <span class="keywordflow">return</span>;</div>
<div class="line"><a name="l00209"></a><span class="lineno">  209</span>&#160;    }</div>
<div class="line"><a name="l00210"></a><span class="lineno">  210</span>&#160;</div>
<div class="line"><a name="l00211"></a><span class="lineno">  211</span>&#160;    <span class="comment">// Divide the whole round into 8 directions</span></div>
<div class="line"><a name="l00212"></a><span class="lineno">  212</span>&#160;    uchar         ang  = 127 - an;</div>
<div class="line"><a name="l00213"></a><span class="lineno">  213</span>&#160;    <a class="code" href="convolution3x3_8cl.xhtml#ac06f3e24d3fffd3c465d8b2a6e7c985e">DATA_TYPE_OUT</a> q_an = (ang + 16) &gt;&gt; 5;</div>
<div class="line"><a name="l00214"></a><span class="lineno">  214</span>&#160;</div>
<div class="line"><a name="l00215"></a><span class="lineno">  215</span>&#160;    <span class="comment">// Find the two pixels in the perpendicular direction</span></div>
<div class="line"><a name="l00216"></a><span class="lineno">  216</span>&#160;    short2       x_p = <a class="code" href="canny_8cl.xhtml#a65e45b2f8637f10dd14a427f37c2cd4c">neighbours_coords</a>[q_an].s02;</div>
<div class="line"><a name="l00217"></a><span class="lineno">  217</span>&#160;    short2       y_p = <a class="code" href="canny_8cl.xhtml#a65e45b2f8637f10dd14a427f37c2cd4c">neighbours_coords</a>[q_an].s13;</div>
<div class="line"><a name="l00218"></a><span class="lineno">  218</span>&#160;    DATA_TYPE_IN g1  = *((global DATA_TYPE_IN *)<a class="code" href="helpers_8h.xhtml#a009469e4d9b8fce3b6d5e97d2077827d">offset</a>(&amp;grad, x_p.x, y_p.x));</div>
<div class="line"><a name="l00219"></a><span class="lineno">  219</span>&#160;    DATA_TYPE_IN g2  = *((global DATA_TYPE_IN *)<a class="code" href="helpers_8h.xhtml#a009469e4d9b8fce3b6d5e97d2077827d">offset</a>(&amp;grad, x_p.y, y_p.y));</div>
<div class="line"><a name="l00220"></a><span class="lineno">  220</span>&#160;</div>
<div class="line"><a name="l00221"></a><span class="lineno">  221</span>&#160;    <span class="keywordflow">if</span>((gradient &gt; g1) &amp;&amp; (gradient &gt; g2))</div>
<div class="line"><a name="l00222"></a><span class="lineno">  222</span>&#160;    {</div>
<div class="line"><a name="l00223"></a><span class="lineno">  223</span>&#160;        *((global <a class="code" href="convolution3x3_8cl.xhtml#ac06f3e24d3fffd3c465d8b2a6e7c985e">DATA_TYPE_OUT</a> *)non_max.<a class="code" href="struct_image.xhtml#acf52c23cbd7424606c10a606524e3e32">ptr</a>) = gradient;</div>
<div class="line"><a name="l00224"></a><span class="lineno">  224</span>&#160;    }</div>
<div class="line"><a name="l00225"></a><span class="lineno">  225</span>&#160;}</div>
<div class="ttc" id="helpers_8h_xhtml_a009469e4d9b8fce3b6d5e97d2077827d"><div class="ttname"><a href="helpers_8h.xhtml#a009469e4d9b8fce3b6d5e97d2077827d">offset</a></div><div class="ttdeci">__global uchar * offset(const Image *img, int x, int y)</div><div class="ttdoc">Get the pointer position of a Image. </div><div class="ttdef"><b>Definition:</b> <a href="helpers_8h_source.xhtml#l00295">helpers.h:295</a></div></div>
<div class="ttc" id="canny_8cl_xhtml_a65e45b2f8637f10dd14a427f37c2cd4c"><div class="ttname"><a href="canny_8cl.xhtml#a65e45b2f8637f10dd14a427f37c2cd4c">neighbours_coords</a></div><div class="ttdeci">__constant short4 neighbours_coords[]</div><div class="ttdoc">Array that holds the relative coordinates offset for the neighbouring pixels. </div><div class="ttdef"><b>Definition:</b> <a href="canny_8cl_source.xhtml#l00153">canny.cl:153</a></div></div>
<div class="ttc" id="helpers_8h_xhtml_aebe814363556c244be043b13e7969197"><div class="ttname"><a href="helpers_8h.xhtml#aebe814363556c244be043b13e7969197">CONVERT_TO_IMAGE_STRUCT</a></div><div class="ttdeci">#define CONVERT_TO_IMAGE_STRUCT(name)</div><div class="ttdef"><b>Definition:</b> <a href="helpers_8h_source.xhtml#l00096">helpers.h:96</a></div></div>
<div class="ttc" id="struct_image_xhtml"><div class="ttname"><a href="struct_image.xhtml">Image</a></div><div class="ttdoc">Structure to hold Image information. </div><div class="ttdef"><b>Definition:</b> <a href="helpers_8h_source.xhtml#l00134">helpers.h:134</a></div></div>
<div class="ttc" id="struct_image_xhtml_acf52c23cbd7424606c10a606524e3e32"><div class="ttname"><a href="struct_image.xhtml#acf52c23cbd7424606c10a606524e3e32">Image::ptr</a></div><div class="ttdeci">__global uchar * ptr</div><div class="ttdoc">Pointer to the starting postion of the buffer. </div><div class="ttdef"><b>Definition:</b> <a href="helpers_8h_source.xhtml#l00136">helpers.h:136</a></div></div>
<div class="ttc" id="convolution3x3_8cl_xhtml_ac06f3e24d3fffd3c465d8b2a6e7c985e"><div class="ttname"><a href="convolution3x3_8cl.xhtml#ac06f3e24d3fffd3c465d8b2a6e7c985e">DATA_TYPE_OUT</a></div><div class="ttdeci">#define DATA_TYPE_OUT</div><div class="ttdef"><b>Definition:</b> <a href="convolution3x3_8cl_source.xhtml#l00031">convolution3x3.cl:31</a></div></div>
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<h2 class="groupheader">Variable Documentation</h2>
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          <td class="memname">__constant short4 neighbours_coords[]</td>
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<b>Initial value:</b><div class="fragment"><div class="line">=</div>
<div class="line">{</div>
<div class="line">    { -1, 0, 1, 0 },  </div>
<div class="line">    { -1, 1, 1, -1 }, </div>
<div class="line">    { 0, 1, 0, -1 },  </div>
<div class="line">    { 1, 1, -1, -1 }, </div>
<div class="line">    { 1, 0, -1, 0 },  </div>
<div class="line">    { 1, -1, -1, 1 }, </div>
<div class="line">    { 0, 1, 0, -1 },  </div>
<div class="line">    { -1, -1, 1, 1 }, </div>
<div class="line">    { -1, 0, 1, 0 },  </div>
<div class="line">}</div>
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<p>Array that holds the relative coordinates offset for the neighbouring pixels. </p>

<p>Definition at line <a class="el" href="canny_8cl_source.xhtml#l00153">153</a> of file <a class="el" href="canny_8cl_source.xhtml">canny.cl</a>.</p>

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